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Why You Don't Put a Cheap Filter on an Expensive Lens

9 monthes ago   |   By Peta Pixel

I recently took my Sony A7 III and a rented $2,500 Sony FE 100-400mm f/4.5-5.6 GM OSS lens to the 2018 Montreal GP. A friend of mine had recommended that I use a polarizer. I remembered that I had a pack of 77mm Vivitar Series 1 filters that came with my 24-105mm, so I threw that onto the 100-400mm and started shooting, completely zoomed at 400mm.
A photo shot with the cheap CPL filter.
A photo shot without a filter.
Crops of the above photos. Cheap CPL compared to no CPL .
It was bright out, so it took me a while to notice that the images on the back of the camera didn't look right: I was...
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